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Parametros geneticos de la eficiencia en el uso de nitrogeno en lineas de maiz de valles altos

By: Arellano Vazquez, J.L | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Alcantar G., G [coaut.] | Castillo Gonzalez, F [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B [eds.] | Martinez G., A [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Combining ability | Diallel crossing | Fertilizer application | Highlands | Nitrogen content | CIMMYT | Zea mays AGROVOC | Nitrogen fertilizers AGROVOC | Hybrids AGROVOCDDC classification: 633.153 Summary: The objectives of this study were to evaluate the nitrogen (N) lese, through yield and other related traits, of maize inbred lines, and to estimate the genetic parameters, general combining ability (GCA) and specific combining ability (SCA),for the traits using a diallel of crosses among these lines. Fourteen inbred lines and 91 single-cross hybrids, arranged in a Griffing's (1956) Method 4 design, were grown separately under 0 and 200 kg N/ha, using a split-plot experimental design in complete blocks. Among the inbred lines there were no significant differences between N regimes for grain yield, anthesis- silking interval, grain per ear, or barrenness. Highly significant differences were observed for all traits among crosses for N regimes, among hybrids within N regimes, and for N regime x hybrids interaction. With minor exceptions the higher yielding F1 hybrids under 200 kg N/ha were the same under 0 kg N/ha, and the crosses showed differences of 7-20% in yield between the two N levels. Estimates of GCA and SCA were statistically significant for traits at both N levels. Inbred lines derived from local maize varieties showed smaller GCA effects than lines derived from widely-adapted populations; however, the F1 hybrids resulting from crosses between these two classes of lines showed large SCA effects for yield and grain per N gram under both N regimes. Because SCA effects were larger under 0 N, we consider that these effects were more important under low N than under high N availability.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 2K624179
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The objectives of this study were to evaluate the nitrogen (N) lese, through yield and other related traits, of maize inbred lines, and to estimate the genetic parameters, general combining ability (GCA) and specific combining ability (SCA),for the traits using a diallel of crosses among these lines. Fourteen inbred lines and 91 single-cross hybrids, arranged in a Griffing's (1956) Method 4 design, were grown separately under 0 and 200 kg N/ha, using a split-plot experimental design in complete blocks. Among the inbred lines there were no significant differences between N regimes for grain yield, anthesis- silking interval, grain per ear, or barrenness. Highly significant differences were observed for all traits among crosses for N regimes, among hybrids within N regimes, and for N regime x hybrids interaction. With minor exceptions the higher yielding F1 hybrids under 200 kg N/ha were the same under 0 kg N/ha, and the crosses showed differences of 7-20% in yield between the two N levels. Estimates of GCA and SCA were statistically significant for traits at both N levels. Inbred lines derived from local maize varieties showed smaller GCA effects than lines derived from widely-adapted populations; however, the F1 hybrids resulting from crosses between these two classes of lines showed large SCA effects for yield and grain per N gram under both N regimes. Because SCA effects were larger under 0 N, we consider that these effects were more important under low N than under high N availability.

Spanish

9802|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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Lunes –Viernes 9:00 am. 17:00 pm. Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org